388 
ME. WAEEEN DB LA EUE ON THE 
From Table III. it is possible to derive several elements of the eclipse ; for example, 
the epochs of first and last contacts, and the duration of the eclipse. 
The distance of the sun and moon’s centres at the epoch of 
No. 7 was . . . 1827'8 
No. 8 was . . . 1734‘8 
No. 9 was . . . 1573'5 
No. 41 was . . . 1602-4 
No. 42 was . . . 1715-9 
No. 43 was . . . 1805-8 
Avhence is derived, as the mean motion per minute, in the interval between 
7 and 9 . . . =25-263 
41 and 43 . . . =30-022 
At first contact. Last contact. 
// // 
The augmented moon’s radius was 994-5 990-7 
The sun’s radius 911*8 . . . . 944*8 
1939-3 1935-5 
By deducting from these sums of the radii the corresponding distances of the centres in 
photographs 7, 8, and 9, and in 41, 42, and 43 respectively, and dividing the numbers so 
obtained by the corresponding rates of approach or retreat of the centres, the intervals 
are derived which have elapsed between the epochs of the first contact and the epochs 
of the photographs, on the one hand ; and on the other, the intervals which must have 
elapsed between the epochs of the photographs and the last contact of the sun and moon. 
By subtracting from the epochs of Nos. 7, 8, and 9, and adding to those of Nos. 41, 42, 
and 43 their several intervals, the following periods result : — 
Eirst contact. 
Last contact. 
h 
min. sec. 
h min. sec. 
No. 7 . 
. 1 
48 6-4 
No. 41 . 
. 4 10 4-0 
No. 8 . 
. 1 
47 57-4 
No. 42 . 
. 4 10 2-7 
No. 9 . 
. 1 
48 6-4 
No. 43 . 
o 
o 
T— 1 
Mean . 
. 1 
48 3-4* 
Mean . 
. 4 10 3-6 
whence the duration of the eclipse is found to have been 2 h. 22 min. 0*2 sec. 
o 
The position-angle of the line joining the centres at 1 h. 54-3 min. was . . 296 54-2 
and by adding the decrease in the position-angle since the period of first 
contact, as calculated from the numbers in Table III 1*5 
we obtain for period of first contact the position-angle 296 56 
which agrees very nearly with the angle calculated by Mr. Carrington and Mr. 
Farley, namely 296° 54'. In the same manner, the position-angle of the line joining 
the centres at the epochs of last coiitact was found to be 117° 12' 
Mr. Carrington’s number is . . . 117 20 
Mr. Farley’s 117 18 
* The time of first contact observed with the achromatic was 1 h. 48 m. 6-6 sec. p. 354. 
